CN101340532A - Brightness automatic compensating method of television image dark field - Google Patents
Brightness automatic compensating method of television image dark field Download PDFInfo
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- CN101340532A CN101340532A CNA2007100763012A CN200710076301A CN101340532A CN 101340532 A CN101340532 A CN 101340532A CN A2007100763012 A CNA2007100763012 A CN A2007100763012A CN 200710076301 A CN200710076301 A CN 200710076301A CN 101340532 A CN101340532 A CN 101340532A
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Abstract
The invention discloses a method used for automatically compensating the television image brightness dark field in the field of television image technique, comprising the steps as follows: S1: the average value of single pixel brightness is calculated, namely, the brightness average value of each frame of image is used for dividing the pixel value of the frame of image; S2: the dark field image brightness compensation value is calculated, namely, for the dark field image, the brightness compensation value is gained according to the average value of single pixel brightness gained according to the S1 step; S3: the brightness is compensated; namely, the brightness compensation value gained in the S2 step is added to the current image brightness value, and then the sum of the brightness compensation value and the current image brightness value is taken as a new brightness value. The television image dark brightness automatic compensation method of the technical proposal of the invention uses the brightness average of single pixel as the brightness measurement standard of one frame of image, can be applicable to various modes and can be compatible for line-by-line and interlacing, can effectively improve the intelligence of the television, reduce the eye fatigue and meet the healthy concept of the modern.
Description
Technical field
The present invention relates to TV images brightness technology, be specifically related to the automatic compensating method of television image dark field brightness.
Background technology
At present, the television set design is not done any technical finesse at the details in a play not acted out on stage, but told through dialogues in the TV programme, therefore much more especially the user runs into such problem through regular meeting: when watching details in a play not acted out on stage, but told through dialogues TV programme, the user can feel that one of video screen is black, object in the scene does not just see at all, and be easy to occur kopiopia, the solution that the user is general is exactly manually image brightness to be increased; After image changes to bright field by details in a play not acted out on stage, but told through dialogues, again the brightness of image is lowered, not very convenient just during user's TV reception like this.
Summary of the invention
The technical problem to be solved in the present invention is, proposes a kind of automatic compensating method of television image dark field brightness, makes spectators when watching the TV programme of details in a play not acted out on stage, but told through dialogues, do not need artificially manually to intervene, and just can reach and watch effect preferably.
For solving the problems of the technologies described above, the technical solution used in the present invention is: television image brightness details in a play not acted out on stage, but told through dialogues is the method for compensation automatically, it is characterized in that, comprises the steps:
S1, the single pixel intensity mean value of calculating: be about to the pixel value of the average brightness of a two field picture divided by this two field picture;
S2, calculate darkfield image luminance compensation value:, obtain the luminance compensation value according to the single pixel intensity mean value of S1 step gained promptly for darkfield image;
S3, carry out luminance compensation: be about to the luminance compensation value and the present image added luminance of S2 step gained, as new brightness value.
Further, also comprise the step of distinguishing details in a play not acted out on stage, but told through dialogues and bright field: promptly before described S2 step is calculated darkfield image luminance compensation value,, judge that whether it is less than the compensation threshold values earlier according to the single pixel intensity mean value of S1 step gained; Be then to be details in a play not acted out on stage, but told through dialogues, carry out luminance compensation; Otherwise be bright field, do not carry out luminance compensation.
Further, described compensation threshold values is set according to different movements and signal source.
Further, in the described S2 step, the luminance compensation value is looked into the luminance compensation table according to single pixel intensity mean value and is obtained.
Further, described luminance compensation table designs according to movement and signal source.
Further, the average brightness of the described two field picture of S1 step is half of odd field and even field average brightness sum.
Further, the odd field average brightness is zero in progressive signal.
Further, the described pixel value of S1 step, for interlace signal, pixel value is odd field and even field pixel summation.
Adopt the brightness automatic compensating method of television image dark field of technical solution of the present invention, with the average brightness of single pixel brightness criterion as a two field picture, can adapt to various standards and compatibility line by line and interlacing, can effectively improve the intellectuality of television set, reduce kopiopia, meet modern's health idea.
Description of drawings
Fig. 1 is the field synchronization Interrupt Process flow chart of the specific embodiment of the invention;
Fig. 2 is the luminance compensation process chart of the specific embodiment of the invention.
Embodiment
Purpose of the present invention will start luminance compensation exactly when TV programme has details in a play not acted out on stage, but told through dialogues to occur, promote luminance parameter automatically, makes spectators can very clearly see TV; When TV programme returns to bright field, can close luminance compensation automatically, recover normal brightness, prevent the highlighted distortion of image.
Its subject matter that need solve is as follows:
1, the differentiation of details in a play not acted out on stage, but told through dialogues and bright-field image.
Picture signal is constantly to change, and carry out the control of brightness, just must know the brightness value of each, but picture signal is divided into interlacing and progressive signal again, so just must be with the brightness value of each two field picture as a reference.And interlace signal has the branch of 480i, 576i and 1080i, therefore proposes the brightness criterion of the average brightness of single pixel as a two field picture, carries out the differentiation of details in a play not acted out on stage, but told through dialogues and bright-field image.The average brightness of the single pixel of image just can reflect the bright dark degree of image, and image is bright more, and its value is big more; Image is dark more, and its value is more little.
2, the calculating of single pixel intensity mean value.
By the detection of picture processing chip, can obtain the mean value of a field brightness to a field brightness.The average brightness addition of odd field and even field divided by 2 average brightness that just can obtain a two field picture (note: the odd field average brightness in progressive signal is zero).The average brightness of one two field picture just can obtain the average brightness of single pixel divided by the sum of all pixels of a two field picture.The calculating that it is emphasized that a frame pixel of interlace signal is the pixel summation of odd field and even field.
3, the algorithm of darkfield image luminance compensation.
Set a compensation threshold values, itself and single pixel intensity mean value are compared, to determine the bright dark of image, when being worth greater than this, image is a bright field, does not carry out luminance compensation; When being worth less than this, image is details in a play not acted out on stage, but told through dialogues, need carry out luminance compensation.When carrying out luminance compensation, at first to design a luminance compensation table, that is to say that different details in a play not acted out on stage, but told through dialogues brightness should adopt different luminance compensations.Need explanation any be that the design of the setting of threshold values and luminance compensation table mainly now still is provided with according to people's subjectivity.That is to say, when design compensation table and setting compensation threshold values, mainly see constantly that by a plurality of designers it is what fix that a plurality of details in a play not acted out on stage, but told through dialogues scenes are come subjective people.
In general, the luminance compensation value with respect to the brightness adjustment in the picture signal be one more among a small circle, approximately be 5% of brightness adjusting range.The luminance compensation table should be made corresponding adjustment at different movements with the compensation threshold values.When the realization of reality, same movement also should design different luminance compensation tables and compensation threshold values at different signal sources, this mainly is because in the design of TV, the image processing process in unlike signal source also is different, for example AV (Audio Video audio frequency and video) signal source and HD (High Definition high definition) signal source.
The present invention needs sync break on the scene and major cycle two places to realize.Details are as follows for two software modules:
1, the acquisition module of field brightness mean value.
This module is to realize in the field synchronization of input signal is interrupted, and as shown in Figure 1: interrupt after the beginning input signal field, should judge that at first whether this interrupt odd field.If then preserve the average brightness of odd field; If not the average brightness of then preserving even field, input signal field EOI then.
2, the software algorithm module of luminance compensation.
This module realizes that in the major cycle of program as shown in Figure 2: image brightness compensates after the beginning, is at first calculated the average brightness of a two field picture by odd field and even field average brightness; Obtain the average brightness of single pixel then according to signal format; Judge that then single pixel intensity mean value is whether less than the compensation threshold values of image details in a play not acted out on stage, but told through dialogues; If not, then the image brightness compensation finishes; If then obtain current images brightness, and obtain the luminance compensation value by the luminance compensation table; Luminance compensation value and current images added luminance obtain new brightness value, and new brightness value is set at last, thereby make image clear, and the image brightness compensation finishes.
Be example now, illustrate with the AV signal:
1, input signal is a Phase Alternation Line system AV signal.
2, owing to having made fidelity factor, so the size of image input is a upper left point (168,47), lower-right most point (815,594), then the width of image is 647 pixels, highly is 547 pixels.
3, image brightness shows that the scope of (just showing in the menu) is 0～100.The scope that image brightness hardware shows is-512～511.If the image brightness size of current demonstration is 55, suppose that its corresponding image hardware brightness is X, then (X-(512))/1024=55/100; Solve an equation and draw X=51.2.The image hardware brightness of the image brightness correspondence of so current demonstration is 51.
4, the luminance compensation table that is adopted is:
m_AVYCompensation[5][2]
{
{0x52，3}，
{0x48，6}，
{0x3e，9}，
{0x34，12}，
{0x2a，15}，
}
This compensation meter has five groups of offsets, and first number is employed hexadecimal number in the program in every group, expression be the average brightness of single pixel; Second number represents it is the offset of hardware.At 0x48 during to the 0x52 scope, the hardware compensating value is 3 such as the average brightness of single pixel; When the average brightness of single pixel arrived the 0x48 scope at 0x3e, the hardware compensating value was 6; The rest may be inferred, and below 0x2a, the hardware compensating value is 15 at single pixel intensity mean value.Certain single pixel intensity mean value does not just carry out luminance compensation, but following brightness value will be set during greater than 0x52, when the sudden change of image brightness, to recover brightness value.That is to say that 0x52 is exactly the compensation threshold values of AV signal.
What deserves to be explained is, select the compensation threshold values of 0x52 as the AV signal, is the subjective experience value.And the luminance compensation table also is the situation according to different cassette mechanism and signal source, the subjective experience value of being made by a plurality of designers.For example certain television set has one road AV, one road TV (television TV), two-way HD, and so just should change has 4 kinds of subjective designs, and 4 compensation meters are just arranged.
The adjustment process of luminance compensation below is described:
1, under a width of cloth darkfield image, obtains the average brightness 21 of current idol field, strange field brightness mean value 20.(obtained by register, because of not being equal to and actual brightness value, therefore just expression size does not add unit)
2, calculate the single frames average brightness: because the CPU that is adopted does not have floating-point operation, a frame average brightness that calculates is 20.
3, calculate the mean value of single pixel intensity:, therefore enlarge 100 0000 times, i.e. 20*1000/647*1000/547=56=0x38 because the CPU that adopts does not have floating-point operation;
4, determine offset: according to compensation meter at 0x34 between the 0x3e, offset is 12.
5, calculate new image brightness value: the brightness size of current demonstration is 55, and the corresponding hardware size is 51.Add offset, new image brightness should be 63.(new image brightness value, should within image brightness hardware scope-512～511)
6, new brightness value is set, is about to 63 and is set at new brightness value.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (8)
1, the method for the automatic compensation of television image brightness details in a play not acted out on stage, but told through dialogues is characterized in that, comprises the steps:
S1, the single pixel intensity mean value of calculating: be about to the pixel value of the average brightness of a two field picture divided by this two field picture;
S2, calculate darkfield image luminance compensation value:, obtain the luminance compensation value according to the single pixel intensity mean value of S1 step gained promptly for darkfield image;
S3, carry out luminance compensation: be about to the luminance compensation value and the present image added luminance of S2 step gained, as new brightness value.
2, the method for the automatic compensation of television image brightness details in a play not acted out on stage, but told through dialogues according to claim 1, it is characterized in that, also comprise the step of distinguishing details in a play not acted out on stage, but told through dialogues and bright field: promptly before described S2 step is calculated darkfield image luminance compensation value, according to the single pixel intensity mean value of S1 step gained, judge that whether it is less than the compensation threshold values earlier; Be then to be details in a play not acted out on stage, but told through dialogues, carry out luminance compensation; Otherwise be bright field, do not carry out luminance compensation.
3, the method for the automatic compensation of television image brightness details in a play not acted out on stage, but told through dialogues according to claim 2 is characterized in that, described compensation threshold values is set according to different movements and signal source.
4, the method for the automatic compensation of television image brightness details in a play not acted out on stage, but told through dialogues according to claim 1 is characterized in that in the described S2 step, the luminance compensation value is looked into the luminance compensation table according to single pixel intensity mean value and obtained.
5, the method for the automatic compensation of television image brightness details in a play not acted out on stage, but told through dialogues according to claim 4 is characterized in that described luminance compensation table designs according to movement and signal source.
6, the method for the automatic compensation of television image brightness details in a play not acted out on stage, but told through dialogues according to claim 1 is characterized in that the average brightness of the described two field picture of S1 step is half of odd field and even field average brightness sum.
7, the method for the automatic compensation of television image brightness details in a play not acted out on stage, but told through dialogues according to claim 6 is characterized in that, the odd field average brightness is zero in progressive signal.
8, the method for the automatic compensation of television image brightness details in a play not acted out on stage, but told through dialogues according to claim 1 is characterized in that, the described pixel value of S1 step, and for interlace signal, pixel value is odd field and even field pixel summation.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105592270A (en) * | 2015-12-18 | 2016-05-18 | 广东欧珀移动通信有限公司 | Image brightness compensation method and device, and terminal device |
| CN102547161B (en) * | 2010-09-22 | 2017-04-12 | 株式会社尼康 | Image processing apparatus, image processing method and electronic camera |
| CN107039000A (en) * | 2017-05-05 | 2017-08-11 | 深圳市华星光电技术有限公司 | The vision signal adjuster and vision signal adjusting method of display device |
-
2007
- 2007-07-02 CN CNA2007100763012A patent/CN101340532A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102547161B (en) * | 2010-09-22 | 2017-04-12 | 株式会社尼康 | Image processing apparatus, image processing method and electronic camera |
| CN105592270A (en) * | 2015-12-18 | 2016-05-18 | 广东欧珀移动通信有限公司 | Image brightness compensation method and device, and terminal device |
| CN107039000A (en) * | 2017-05-05 | 2017-08-11 | 深圳市华星光电技术有限公司 | The vision signal adjuster and vision signal adjusting method of display device |
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